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The girls were born 13 weeks premature — weighing between 2 pounds 1 ounce and 2 pounds 8 ounces. On Facebook, the Fugates say their four bundles of joy are doing well — though they’re still on ventilators while their lungs continue to develop.

To give you an idea of just how rare this is, the chances of spontaneous quadruplets are about 1 in 729,000. Doctors say the chances of all four being identical are almost incomprehensible.

Facebook's annual "Year In Review" feature recaps moments that users shared on the social media site during the past year, but PC Magazine reported Friday that a glitch that might be related to the feature is concerning to some.